| 摘要 |
PURPOSE:To exactly execute photometry as for the light quantity from a liquid crystal display at ever R, G and B, by providing a color filter for leading a light beam of one color among three primary colors, an respective photoelectric converting elements. CONSTITUTION:A light receiving part 32 is attached so as to cover photodiodes 33-35, and in the first member 36, light passing holes 38-40 are formed in an in-line array by separating them, respectively, so that a light beam from a liquid crystal panel reaches each photodiode 33-35. In a second member 37 containing parts 41-43 which communicate to respective holes 38-40, and also, contain the photodiode 33-35 are formed. Also, on front of the photodiodes 33-35, color filters 44-46 of R, G and B are attached, respectively. The first and the second members 36, 37 are made of, for instance, bakelite, and an action for obstructing a reflection of light is performed to the inside surface of each hole 38-40. In such a way, the light quantity from a liquid crystal display can be exactly subjected to the photometry.
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